Abstract
The exciton-exciton interaction energy of tellurium doped CdSe colloidal quantum dots is experimentally investigated. The dots exhibit a strong Coulomb repulsion between the two excitons, which results in a huge measured biexciton blue shift of up to 300 meV. Such a strong Coulomb repulsion implies a very narrow hole wave function localized around the defect, which is manifested by a large Stokes shift. Moreover, we show that the biexciton blue shift increases linearly with the Stokes shift. This result is highly relevant for the use of colloidal QDs as optical gain media, where a large biexciton blue shift is required to obtain gain in the single exciton regime.
| Original language | English |
|---|---|
| Pages (from-to) | 2384-2387 |
| Number of pages | 4 |
| Journal | Nano Letters |
| Volume | 8 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Aug 2008 |
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ASJC Scopus subject areas
- Condensed Matter Physics
- Bioengineering
- Chemistry(all)
- Materials Science(all)
- Mechanical Engineering
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Large blue shift of the biexciton state in tellurium doped CdSe colloidal quantum dots. / Avidan, Assaf; Oron, Dan.
In: Nano Letters, Vol. 8, No. 8, 08.2008, p. 2384-2387.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Large blue shift of the biexciton state in tellurium doped CdSe colloidal quantum dots
AU - Avidan, Assaf
AU - Oron, Dan
PY - 2008/8
Y1 - 2008/8
N2 - The exciton-exciton interaction energy of tellurium doped CdSe colloidal quantum dots is experimentally investigated. The dots exhibit a strong Coulomb repulsion between the two excitons, which results in a huge measured biexciton blue shift of up to 300 meV. Such a strong Coulomb repulsion implies a very narrow hole wave function localized around the defect, which is manifested by a large Stokes shift. Moreover, we show that the biexciton blue shift increases linearly with the Stokes shift. This result is highly relevant for the use of colloidal QDs as optical gain media, where a large biexciton blue shift is required to obtain gain in the single exciton regime.
AB - The exciton-exciton interaction energy of tellurium doped CdSe colloidal quantum dots is experimentally investigated. The dots exhibit a strong Coulomb repulsion between the two excitons, which results in a huge measured biexciton blue shift of up to 300 meV. Such a strong Coulomb repulsion implies a very narrow hole wave function localized around the defect, which is manifested by a large Stokes shift. Moreover, we show that the biexciton blue shift increases linearly with the Stokes shift. This result is highly relevant for the use of colloidal QDs as optical gain media, where a large biexciton blue shift is required to obtain gain in the single exciton regime.
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U2 - 10.1021/nl801241m
DO - 10.1021/nl801241m
M3 - Article
VL - 8
SP - 2384
EP - 2387
JO - Nano Letters
JF - Nano Letters
SN - 1530-6984
IS - 8
ER -